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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P0134 Or DTC P0154 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
    3. NOTE: If fuel monitor DTCs P0131, P0132, P0151 or P0152 is also present, ignore it until DTC P0134 or P0154 is fixed.
  3. Verify Related Pending Code Or Stored DTCs -  Turn ignition off, then on (engine off). Verify pending code or stored DTCs using WDS or equivalent. If any other DTC is present, go to appropriate DTC trouble shooting procedure. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other DTCs are present, go to next step.
  4. Identify Trigger DTC For FREEZE FRAME DATA -  If DTC P0134 or P0154 is on FREEZE FRAME DATA, go to next step. If DTCs P0134 or P0154 triggered FREEZE FRAME DATA, go to appropriate DTC trouble shooting procedure for DTC that triggered FREEZE FRAME DATA. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  5. Verify Current Input Signal Status -  Warm up engine. Access O2S11 for P0134 or O2S21 for P0154 PID using WDS or equivalent. Verify PID while racing engine in Park (ATX) or Neutral (MTX):
    • Rich Condition -  0.55 volt or more when the accelerator pedal is suddenly depressed.
    • Lean Condition -  0.55 volt or less just after release of accelerator pedal.
    If PID reading is not as specified, go to next step. If PID reading is okay, go to step  8.
  6. Inspect Installation Of Right & Left Front HO2Ss -  Check if right and left front HO2Ss are loosely installed. If right and left front HO2Ss are installed securely, go to next step. If either front HO2S is loose, tighten suspect HO2Ss securely. After repair, go to step  10.
  7. Inspect Gas Leakage From Exhaust System -  Visually check if any gas leakage is found between exhaust manifold and right and left front HO2Ss. If any gas leakage is present, replace faulty exhaust system component. After repair, go to step  10. If no exhaust leaks are present, inspect following harnesses for open or short circuit to ground, repair faulty wire or replace wire harness if necessary:
    • Right front HO2S 4-pin harness connector terminal "A" to PCM 104-pin harness connector terminal No. 60 (Yellow wire).
    • Left front HO2S 4-pin harness connector terminal "A" to PCM 104-pin harness connector terminal No. 87 (Green wire).
    Repair or replace harness if necessary. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If all items are okay, replace faulty HO2S. After repair, go to step  10.
    8. WARNING: Removing radiator cap when radiator is hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. When removing radiator cap, wrap a thick cloth around and turn it slowly.
    NOTE: If there are any small bubbles which make engine coolant White at filler opening, air is getting in from poor sealing at head gasket or other areas between combustion chamber and engine coolant passage. Large bubbles are normal since they are remaining air coming out from engine coolant passage.
  8. Inspect Sealing Of Engine Coolant Passage -  Remove radiator cap. Perform procedure to bleed air from engine coolant, then run engine at idle. If there are any small bubbles which make engine coolant White at filler opening, repair or replace faulty parts. After repair, go to step  10. If small bubbles are not present, go to next step.
  9. Inspect Engine Compression -  Inspect engine compression. Refer to MECHANICAL INSPECTION in BASIC DIAGNOSTIC PROCEDURES article. If engine compression is okay, go to next step. If engine compression is not okay, perform engine overhaul for repairs. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0134 Or P0154 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Access ECT and RPM PIDs using WDS or equivalent. Make sure that ECT PID is more than 158°F (70°C). Increase engine speed to 1500 RPM or more for 95 seconds or more. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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